Princess Diana's Cannes Dress Was Bluer Than the Sky and as Whimsical as a Dream

For her first appearance on the Cannes Film Festival red carpet, Diana wore a puffy Catherine Walker dress with a double-breasted white blazer.

She accessorised her outfit with black-and-white pumps.

She wore a simple blue chiffon dress by Catherine Walker, which was reportedly meant as an homage to a gown Princess Grace of Monaco wore in Alfred Hitchcock's To Catch a Thief.